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Side by Side Diff: mojo/edk/embedder/platform_channel_utils_posix.h

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_
6 #define MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_
7
8 #include <stddef.h>
9 #include <sys/types.h> // For |ssize_t|.
10
11 #include <deque>
12
13 #include "base/memory/scoped_ptr.h"
14 #include "mojo/edk/embedder/platform_handle.h"
15 #include "mojo/edk/system/system_impl_export.h"
16
17 struct iovec; // Declared in <sys/uio.h>.
18
19 namespace mojo {
20 namespace embedder {
21
22 // The maximum number of handles that can be sent "at once" using
23 // |PlatformChannelSendmsgWithHandles()|.
24 // TODO(vtl): This number is taken from ipc/file_descriptor_set_posix.h:
25 // |FileDescriptorSet::kMaxDescriptorsPerMessage|. Where does it come from?
26 const size_t kPlatformChannelMaxNumHandles = 7;
27
28 // Use these to write to a socket created using |PlatformChannelPair| (or
29 // equivalent). These are like |write()| and |writev()|, but handle |EINTR| and
30 // never raise |SIGPIPE|. (Note: On Mac, the suppression of |SIGPIPE| is set up
31 // by |PlatformChannelPair|.)
32 MOJO_SYSTEM_IMPL_EXPORT ssize_t
33 PlatformChannelWrite(PlatformHandle h, const void* bytes, size_t num_bytes);
34 MOJO_SYSTEM_IMPL_EXPORT ssize_t
35 PlatformChannelWritev(PlatformHandle h, struct iovec* iov, size_t num_iov);
36
37 // Writes data, and the given set of |PlatformHandle|s (i.e., file descriptors)
38 // over the Unix domain socket given by |h| (e.g., created using
39 // |PlatformChannelPair()|). All the handles must be valid, and there must be at
40 // least one and at most |kPlatformChannelMaxNumHandles| handles. The return
41 // value is as for |sendmsg()|, namely -1 on failure and otherwise the number of
42 // bytes of data sent on success (note that this may not be all the data
43 // specified by |iov|). (The handles are not closed, regardless of success or
44 // failure.)
45 MOJO_SYSTEM_IMPL_EXPORT ssize_t
46 PlatformChannelSendmsgWithHandles(PlatformHandle h,
47 struct iovec* iov,
48 size_t num_iov,
49 PlatformHandle* platform_handles,
50 size_t num_platform_handles);
51
52 // TODO(vtl): Remove this once I've switched things over to
53 // |PlatformChannelSendmsgWithHandles()|.
54 // Sends |PlatformHandle|s (i.e., file descriptors) over the Unix domain socket
55 // (e.g., created using PlatformChannelPair|). (These will be sent in a single
56 // message having one null byte of data and one control message header with all
57 // the file descriptors.) All of the handles must be valid, and there must be at
58 // most |kPlatformChannelMaxNumHandles| (and at least one handle). Returns true
59 // on success, in which case it closes all the handles.
60 MOJO_SYSTEM_IMPL_EXPORT bool PlatformChannelSendHandles(PlatformHandle h,
61 PlatformHandle* handles,
62 size_t num_handles);
63
64 // Wrapper around |recvmsg()|, which will extract any attached file descriptors
65 // (in the control message) to |PlatformHandle|s (and append them to
66 // |platform_handles|). (This also handles |EINTR|.)
67 MOJO_SYSTEM_IMPL_EXPORT ssize_t
68 PlatformChannelRecvmsg(PlatformHandle h,
69 void* buf,
70 size_t num_bytes,
71 std::deque<PlatformHandle>* platform_handles);
72
73 } // namespace embedder
74 } // namespace mojo
75
76 #endif // MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_
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